Ericsson Wi Fi 40005001 802.11n dual-band WIFI router User Manual BelAir20e User Guide

Ericsson Wi-Fi 802.11n dual-band WIFI router BelAir20e User Guide

User Manual

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Document TitleBelAir20e_User_Guide .book
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Document Author: Felix

BelAir20E
BelAir20E
User Guide
Release:
12.0
Document Date:
Document Number:
Document Status:
October 11, 2011
BDTM02201-A01
Standard
Security Status:
Confidential
Customer Support:
613-254-7070
1-877-BelAir1 (235-2471)
techsupport@belairnetworks.com
© Copyright 2011 by BelAir Networks.
The information contained in this document is confidential and proprietary to BelAir Networks. Errors and Omissions Excepted.
Specification may be subject to change. All trademarks are the property of their respective owners.
Protected by U.S. Patents: 7,171,223, 7,164,667, 7,154,356, 7,030,712 and D501,195. Patents pending in the U.S. and other countries.
BelAir Networks, the BelAir Logo, BelAir200, BelAir200D, BelAir100, BelAir100S, BelAir100C, BelAir100T, BelAir20, BelAir20M, BelAir20E, BelAir20EO, BelAir100M,
BelAir100i, BelAir100SN, BelAir100SNE, BelAir100N, BelAir100P, BelView and BelView NMS are trademarks of BelAir Networks Inc.
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BelAir20E User Guide
Contents
Contents
About This Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
BelAir20E Configuration Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . 6
Command Line Interface Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
BelAir20E Access Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
User and Session Administration . . . . . . . . . . . . . . . . . . . . . . . . . . 35
IP Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
BelAir20E Auto-configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Ethernet or LAN Interface Settings . . . . . . . . . . . . . . . . . . . . . . . . 64
Card Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Wi-Fi Radio Configuration Overview . . . . . . . . . . . . . . . . . . . . . . 71
Configuring Wi-Fi Radio Parameters . . . . . . . . . . . . . . . . . . . . . . . 72
Configuring Wi-Fi Access Point Parameters . . . . . . . . . . . . . . . . . 80
Wi-Fi AP Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Wi-Fi Backhaul Link Configuration . . . . . . . . . . . . . . . . . . . . . . . 115
Mobile Backhaul Mesh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Mobile Backhaul Point-to-point Links . . . . . . . . . . . . . . . . . . . . . 127
Operating in High Capacity and Interference Environments. . . . 138
DHCP Relay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Network Address Translation . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Universal Access Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Using Layer 2 Tunnels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Quality of Service Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Layer 2 Network Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 183
Performing a Software Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . 197
For More Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Definitions and Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Conformity and Regulatory Statements. . . . . . . . . . . . . . . . . . . . 210
Appendix A: Node Configuration Sheets . . . . . . . . . . . . . . . . . . 221
Appendix B: Mesh Auto-connection Example . . . . . . . . . . . . . . 224
Appendix C: Scripting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . 234
Appendix D: BelAir20E Factory Defaults . . . . . . . . . . . . . . . . . . 251
Detailed Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
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BelAir20E User Guide
About This Document
About This Document
This document provides the information you need to install and configure the
BelAir20E™, and the procedures for using the BelAir20E Command Line
Interface (CLI).
This document may contain alternate references to the product. Table 1 shows
possible synonyms to the product name.
Table 1: Product Name Synonyms
Product Name
Synonym
BelAir20™, BelAir20E™, BelAir20EO™
BA20
Typographical
Conventions
This document uses the following typographical conventions:
Related
Documentation
The following titles are BelAir reference documents:
October 11, 2011
• Text in < > indicates a parameter required as input for a CLI command;
for example, < IP address >
• Text in [ ] indicates optional parameters for a CLI command.
• Text in { } refers to a list of possible entries with | as the separator.
• Parameters in ( ) indicate that at least one of the parameters must entered.
• BelAir20E Quick Install Guide
• BelAir20E Troubleshooting Guide
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System Overview
System Overview
The BelAir20E Access Point (AP) is an evolution of BelAir Networks indoor
solution and part of BelAir Networks industry leading product portfolio. The
BelAir20E adds standards-based beamforming, five Gigabit Ethernet ports
(one WAN port with PoE and four LAN ports), integrated antennas, and full
802.11n compliance (802.11n-2009) to BelAir Networks leading low cost, high
capacity indoor access.
The next generation BelAir20E continues to lead with the industry’s highest
performance and most flexible indoor access node. Offering all the same
features and management as the other BelAir products, the BelAir20E has been
optimized for managed hot spot applications, with Edge Policy Enforcement
using centralized control and a true Plug-and-Play architecture. And, with the
latest fully compliant 802.11n, it is ideal for even the most demanding
applications, including voice and video. The BelAir20E also provides
connectivity between indoor and outdoor networks, enabling true
standards-based seamless mobility as users move from outside to inside.
The operating temperature of the BelAir20E is -20 ºC to +50 ºC.
The BelAir20E is available in following variants:
• The BelAir20E-11 is available for the USA only. Operators of the
BelAir20E-11 can set the country of operation only to US. Similarly, the
operating channels, antenna gain, and the transmit power levels can be set
only to values that are valid for the USA.
• The BelAir20E-11R is available for countries other than the USA. Operators
of the BelAir20E-11R can set the country of operation to any BelAir
approved country. Similarly, the operating channels, antenna gain, and the
transmit power levels can be set to values that are valid for the specified
country of operation.
Hardware
Description
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Figure 1 on page 5 shows the relationship between the main BelAir20E
hardware modules.
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System Overview
Figure 1: BelAir20E Hardware Module Block Diagram
Antenna 0
Antenna 1
Antenna 2
Antenna 3
2.4 GHz
Radio
5.8 GHz
Radio
HTME
Reset
LAN
LAN
LAN
LAN
WAN
PoE
48 V DC
AC Power
Adapter
100-240 V AC
The BelAir20E consists of the following modules:
• one High Throughput Module Evolved (HTME) providing:
—a wireline 10/100/1000 Base-TX WAN Ethernet interface to the Internet
—four wireline 10/100/1000 Base-TX LAN Ethernet interfaces
—a 2.4 GHz Wi-Fi radio and a 5.8 GHz Wi-Fi radio using fully compliant
802.11n links. E Each radio can act as an Access Point (AP) or provide
backhaul links. An AP provides user traffic wireless access to the
BelAir20E. Backhaul links connect to other BelAir radios to create a
radio mesh.
• four integrated dual-band antennas
• an external connector field
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BelAir20E Configuration Interfaces
BelAir20E Configuration Interfaces
The BelAir20E can be accessed and configured using the following configuration
interfaces:
• the command line interface (CLI)
• the SNMP interface
• the Web interface (using either HTTPS or HTTP)
All three interfaces (CLI, SNMP and Web) have the same public IP address. All
three also access the same BelAir20E node database. That means that changes
made with one interface are seen immediately through the other interfaces.
Command Line
Interface
The CLI allows you to configure and display all the parameters of a BelAir20E
unit, including:
• system parameters
• system configuration and status
• radio module configuration and status
• user accounts
• BelAir20E traffic statistics
• layer 2 functionality, such as those related to bridging and VLANs
• Quality of Service parameters
• alarm system configuration and alarms history
Each unit can have up to nine simultaneous CLI sessions (Telnet or SSH). For a
description of basic CLI commands and tasks see “Command Line Interface
Basics” on page 12.
SNMP Interface
October 11, 2011
The Simple Network Management Protocol (SNMP) provides a means of
communication between SNMP managers and SNMP agents. The SNMP
manager is typically a part of a network management system (NMS) such as HP
OpenView, while the BelAir20E provides the services of an SNMP agent.
Configuring the BelAir20E SNMP agent means configuring the SNMP
parameters to establish a relationship between the manager and the agent.
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The BelAir20E SNMP agent contains Management Information Base (MIB)
variables. A manager can query an agent for the value of MIB variables, or
request the agent to change the value of a MIB variable.
Refer to the following sections:
• “SNMP Configuration Guidelines” on page 27
• “SNMP Command Reference” on page 28
Integrating the
BelAir20E with a
Pre-deployed NMS
In addition to providing support for the SNMP MIBs described in Table 2, BelAir
Networks provides a number of enterprise MIB definitions that you can
integrate with your Network Management System (NMS). Table 3 on page 8
describes the BelAir20E SNMP MIBs. A copy of the BelAir20E SNMP MIBs is
available from the BelAir Networks online support center at:
www.belairnetworks.com/support/index.cfm.
Table 2: Standard SNMP MIBs
File Name
Description
BRIDGE-MIB.mib
implements RFC1493
IANAifType-MIB.mib
defines standard interface types assigned by the Internet
Assigned Numbers Authority (IANA)
IEEE802dot11-MIB.mib
IEEE MIB to manage 802.11 devices
IF-MIB.mib
implements RFC2863
IP-MIB.mib
defines IP and ICMO data types
PerfHist-TC-MIB.mib
defines data types to support 15-minute performance history
counts
RADIUS-ACC-CLIENT-MIB.mib
implements RFC2620
RADIUS-AUTH-CLIENT-MIB.mib
implements RFC2618
RSTP-MIB.mib
implements 802.1w RSTP
SNMP-COMMUNITY-MIB.mib
defines data types to support co-existence between SNMP
versions
SNMP-FRAMEWORK-MIB.mib
implements RFC3411
SNMP-MPD-MIB.mib
implements RFC3412
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Table 2: Standard SNMP MIBs (Continued)
File Name
Description
SNMP-NOTIFICATION-MIB.mib
implements RFC3413
SNMP-TARGET-MIB.mib
implements RFC3413
SNMP-USER-BASED-SM-MIB.mib
implements RFC3414
SNMPv2-CONF.mib
implements RFC1450
SNMPv2-MIB.mib
implements RFC1907
SNMPv2-SMI.mib
implements RFC1450
SNMPv2-TC.mib
implements RFC1450
SNMP-VIEW-BASED-ACM-MIB.mib
implements RFC3415
Table 3: BelAir Enterprise MIBs
File Name
Description
BELAIR-IEEE802DOT11-CLIENT.mib
BELAIR-IEEE802DOT11.mib
defines features that are not supported by the standard
IEEE802.11 MIB
BELAIR-IP.mib
defines BelAir IP data types
BELAIR-MESH.mib
defines BelAir multipoint-to-multipoint data types
BELAIR-MOBILITY.mib
defines data types to support mobile backhaul mesh and
point-to-point links
BELAIR-PHYIF-MAPPING.mib
defines data types to support universal slots
BELAIR-PRODUCTS.mib
defines product object IDs
BELAIR-RSTP.mib
defines RSTP data types
BELAIR-SMI.mib
defines BelAir top level OID tree
BELAIR-SYSTEM.mib
defines basic OAM features such as software download,
temperature and BelAir alarms
BELAIR-TC.mib
defines BelAir data types
BELAIR-TUNNEL.mib
defines L2TP data types
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Table 3: BelAir Enterprise MIBs (Continued)
File Name
Description
BELAIR-WRM.mib
defines BelAir WiMAX data types
The procedure for importing the SNMP MIB definition files depends on the
deployed NMS platform. Refer to your NMS platform documentation for
details.
Web Interface
BelAir Networks has verified that the BelAir20E Web interface operates
correctly with the following web browsers:
• Microsoft Internet Explorer version 6.0, service pack 2
• Mozilla Firefox version 1.5, or later
Accessing the Web
Interface
You can access the Web interface using either secure HTTP (HTTPS) or HTTP.
Both HTTP and HTTPS are enabled when each BelAir20E node is shipped. Each
unit can have up to five simultaneous CLI sessions (HTTP or HTTPS).
By default, the BelAir20E Web interface has an associated time-out value. If the
interface is inactive for 9 minutes, then you are disconnected from the
interface. To reconnect to the interface, you need to log in again.
Accessing the System
Page with Secure HTTP
or with HTTP
October 11, 2011
To log in to the BelAir20E Web interface and access the main page using HTTPS
or HTTP, do the following steps:
1 Open your Web browser and specify the IP address of the BelAir20E node
you want to access.
The default IP address of each BelAir20E node is: 10.1.1.10.
Figure 2 shows the resulting Login page.
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Figure 2: Typical Login Page
2 Enter a valid user name, such as root, and a valid password.
Note:The specified password is case sensitive.
Figure 3 on page 10 shows a typical resulting main page for the Web
interface.
Figure 3: Typical Web Interface Main Page
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Stopping a Session
To stop a Web interface session, click on the Logout button located in the top
right corner each page. See Figure 3.
Additional
Troubleshooting Tools
The Web interface provides the following tools to display radio performance
metrics:
• a throughput meter
• histogram display of various performance metrics
These tools are only available with the Web interface. For full details, see the
BelAir20E Troubleshooting Guide.
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Command Line Interface Basics
Command Line Interface Basics
Use this chapter to familiarize yourself with basic CLI tasks, including:
• “Connecting to the BelAir20E” on page 12
• “Starting a CLI Session” on page 12
• “Command Modes” on page 14
• “Abbreviating Commands ” on page 18
• “Command History” on page 18
• “Special CLI Keys ” on page 19
• “Help Command” on page 19
• “Common CLI Commands” on page 23
Connecting to the
BelAir20E
You can connect to the BelAir20E default address using one of the following
methods:
• through the BelAir20E radio interface
• by connecting directly to the Ethernet port on the BelAir20E
CAUTION!
Do not connect the BelAir20E to an operational data network before you
configure its desired IP network parameters. This may cause traffic disruptions
due to potentially duplicated IP addresses.
The BelAir20E unit must connect to an isolated LAN, or to a desktop or laptop
PC configured to communicate on the same IP sub-network as the BelAir20E.
Using the Radio Interface
Use a desktop or laptop PC equipped with a wireless 802.11a, 802.11b, 802.11g
or 802.11n compliant interface as required, configured with a static IP address
on the same subnet as the default OAM IP address (for example, 10.1.1.1/24).
For the required configuration procedure, refer to your PC and wireless
interface configuration manuals or contact your network administrator. The PC
will connect to the BelAir20E through the radio interface.
Connecting to the Ethernet Port
Use a cross-connect RJ45 cable to connect the Ethernet port of the unit.
For a detailed procedure, refer to the BelAir20E Installation Guide.
Starting a CLI
Session
October 11, 2011
Start a Telnet or secure shell (SSH) client and connect to the BelAir20E IP
address. If you are configuring the BelAir20E for the first time, you must use the
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BelAir20E default IP address (10.1.1.10). The BelAir20E prompts you for your
user name and password.
The default super-user account is “root”. The default password is “admin123”.
If the login is successful, the BelAir20E prompt is displayed. The default prompt
is “#”, if you login as root. Otherwise, the default prompt string is “>”.
Note 1: The terminal session locks after four unsuccessful login attempts. To
unlock the terminal session, you must enter the super-user password.
Note 2: BelAir20E CLI commands are not case sensitive (uppercase and
lowercase characters are equivalent). However, some command
parameters are case sensitive. For example, passwords and any Service
Set Identifier (SSID) supplied with the radio commands are case
sensitive. Also, all parameters of the syscmd commands are case
sensitive.
Note 3: Later, you will see that you can configure the BelAir20E to have more
than one interface with an IP address. For example, you can configure
Virtual LANs and management interfaces each with their own IP
address. If you do this, make sure your Telnet or secure shell (SSH)
connections are to a management interface. This ensures maximum
responsiveness for your session by keeping higher priority management
IP traffic separate from other IP traffic.
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SSH Session Example of Initial Login
With secure shell, the system prompts you twice for your password.
ssh -l root 10.1.1.10
root@10.1.1.10's password:
BelAir Backhaul and Access Wireless Router
BelAir User: root
Password:
/#
Telnet Session Example of Initial Login
With Telnet, the system prompts you only once for your password.
telnet 10.1.1.10
BelAir Backhaul and Access Wireless Router
BelAir User: root
Password:
/#
Command Modes
The BelAir20E CLI has different configuration “modes”. Different commands
are available to you, depending on the selected mode.
Each card in the BelAir20E has at least one associated physical interface. Some
examples of physical interfaces are a Wi-Fi radio or an Ethernet interface.
Use the mode command to display the modes that are available. Because each
physical interface and each card in the BelAir20E has its own mode, displaying
the modes also displays a profile summary of the BelAir20E. See Figure 4.
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Figure 4: Sample Output of mode Command
• The node has one card. The HTME
card is in slot 1.
/# mode
/card
/htme-1
• The node has the following physical
interfaces:
/interface
/wifi-1-1
/wifi-1-2
/eth-1-1
/lan-1
/lan-2
/lan-3
/lan-4
(HTMEv1 5GHz 802.11n)
(HTMEv1 2.4GHz 802.11n)
(1000BASE-T)
(1000BASE-T)
(1000BASE-T)
(1000BASE-T)
(1000BASE-T)
/mgmt
—Interface wifi-1-1 is associated
with the HTME 5.8 GHz radio.
—Interface wifi-1-2 is associated
with the HTME 2.4 GHz radio.
—Interface eth-1-1 is associated with
the HTME card’s Ethernet
interface.
—Interfaces lan-1 to lan-4 are
associated with the HTME card’s
LAN interfaces.
/protocol
/ip
/nat
/radius
/rstp
/snmp
/sntp
/te-syst
(tunnel)
• The mgmt mode allows you to
control user accounts, which
authentication to use, and whether
you can access the node with Telnet.
• You can control the IP, RADIUS,
RSTP, SNMP, SNTP, L2TP and NAT
protocols through the protocol
mode and its submodes.
/qos
/services
/auto-conn
/mobility
• You can control auto-connect and
backhaul mobility through the
services mode and its submodes.
/ssh
/ssl
/syslog
/system
/diagnostics
• These modes allow you to control
SSH, SSL, Syslog and system settings.
You can also run diagnostics.
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Table 4 describes the modes that are supported.
Table 4: Command Line Interface Modes
Mode
Description
“root” mode (/)
The top or root level of the CLI commands.
Card Management: /card/-
one of:
• htme-
Configure hardware:
• htme is High Throughput Module, evolved
•  is slot number
Physical Interfaces: /interface/--
one of:
• wifi--
• eth--
• lan-
Configure the BelAir20E physical interfaces:
•  is the type of physical interface. One of:
— wifi: 802.11a/b/g/n, HTME radios
— eth: 1000Base-TX, HTME Ethernet
— lan: 1000Base-TX, HTME LAN
•  is the slot number where the interface is located
in the BelAir platform
•  is port number.  is 1 for most interfaces.
The HTME card can have multiple ports representing
multiple Wi-Fi radios operating different frequencies.
Some configurations may have multiple Ethernet or
LAN ports.
Node Management
mgmt
• Configure user accounts, user authentication and
Telnet access
Protocol Management: /protocol/
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Table 4: Command Line Interface Modes (Continued)
Mode
Description
one of:
• ip
• nat
• radius
• rstp
• snmp
• sntp
• te-
Configure the following protocols:
• IP parameters for node and VLANs
• NAT
• RADIUS for user sessions
• RSTP
• SNMP
• SNTP
• L2TP tunnel engine (te). BelAir platforms can have one
tunnel engine per system (syst).
Services: /services/
one of:
• auto-conn
• mobility
Configure the following services:
• Auto-configuration
• Backhaul mobility
Administration
qos
Configure Quality of Service (QoS) parameters
ssh
Configure Secure Shell (SSH) parameters
ssl
Configure Secure Socket Layer (SSL) parameters
syslog
Configure the destination of SYSLOG messages
See the BelAir20E Troubleshooting Guide for details.
system
System and node configuration and administration
diagnostics
Run link diagnostics.
You can move between modes with the cd command. For instance, you can
move from root mode to system mode using the command:
/# cd /system
/system#
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Note 1: The prompt changes to match the current mode. You can further
customize the prompt to show the switch name or a 20-character
string that you define.
Note 2: Access to a mode is only allowed if the user has sufficient privileges to
execute commands in that mode.
When you access a given mode, only the commands pertaining to that mode
are available. For example, accessing snmp mode provides access to SNMP
commands. For a physical interface, this means that only the commands that
apply to that specific type and version of interface are available when you access
a particular physical interface. For example, if you access an HTMEv1 interface,
only the commands that apply to an HTMEv1 Wi-Fi radio are available.
Entering ? displays the commands that apply to the currently accessed mode.
Entering ?? or help displays the commands that apply to the currently accessed
mode plus common commands that are available in all modes.
Users may execute commands from other modes than the current one, by
prefixing the desired command with the slash character ‘/’ followed by the
mode’s name. For instance, entering:
/system# /protocol/snmp/show community
executes a command from snmp mode while in system mode.
Abbreviating
Commands
You must enter only enough characters for the CLI to recognize the command
as unique.
The following example shows how to enter the mgmt mode command show
telnet status:
/mgmt# sh t s
Command
History
You can use the history command to display a list of the last commands that
you have typed.
Example
/# history
8 h
9 hi
10 ?
11 show user
12 cd /system
13 show loads
14 show sessions
15 cd /
October 11, 2011
Confidential
Document Number BDTM02201-A01 Standard
Page 18 of 267
BelAir20E User Guide
Command Line Interface Basics
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Special CLI Keys
cd interface/wifi-1-1/
show
show ssid table
show statistics
history
Command Completion
You can ask the CLI to complete a partially typed command or mode name by
pressing the tab key. If the command or mode name cannot be completed
unambiguously, the CLI presents you with a list of possible completions. For
instance, entering:
/system# show co{tab}
produces the following output:
Available commands :
show communications
show config-download status
show coordinates
show country [detail]
Execution of the Last Typed Command
You may repeat the last command, by entering the ! key twice, followed by
carriage return.
Executing the Previous Commands
You may browse through the command history by using the up and down arrow
keys of a VT100 or compatible terminal. You can also execute a certain
command from the command history by entering the ! key, followed by the
command number (as displayed in the history command output) and carriage
return.
Help Command
?? []
help []
These commands display:
• a list of commands available in the current mode
• help on a particular command available in the current mode
• help on commands starting with the given keyword in the current mode
Entering "??" is equivalent to entering "help".
October 11, 2011
Confidential
Document Number BDTM02201-A01 Standard
Page 19 of 267
BelAir20E User Guide
Command Line Interface Basics
Available Commands
Entering ? displays the commands that apply to the currently accessed mode.
For example:
/mgmt# ?
Available commands :
adduser  -p  [ -d ] [-g ]
deluser 
moduser  [ -p ] [ -d ] [-g ]
set authentication-login {local | radius }
set telnet {enabled|disabled}
show authentication-login
show telnet status
show user
Entering ?? or help displays the commands that apply to the currently accessed
mode plus common commands that are available in all modes. For example:
/mgmt# ??
Available commands :
adduser  -p  [ -d ] [-g ]
deluser 
moduser  [ -p ] [ -d ] [-g ]
set authentication-login {local | radius }
set telnet {enabled|disabled}
show authentication-login
show telnet status
show user
alias [ ]
cd 
clear-screen
console lock
exit
help [ command ]
history
mode []
passwd
ping  [-l ]
run script